SYS: Learn to use the yum command.

Presentation of yum

yum is a sophisticated piece of software in charge of dealing with packages and their dependencies.yum will be deprecated in future versions of RHEL. But its successor, dnf, will reuse the same syntax.

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yum search versus yum list: first searches through metadata of a package, users could wrongly assume it searches for packages themselves. The second searches for available actual packages, either installed or offered to be installed.